//+------------------------------------------------------------------+
//|                                                          BWI.mq4 |
//|                          Copyright © 2007, ProjectSomewhere.com. |
//|                                 http://www.ProjectSomewhere.com/ |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2007, ProjectSomewhere.com."
#property link      "http://www.projectsomewhere.com/"

#property indicator_separate_window
#property indicator_buffers 1
#property indicator_color1 DodgerBlue
//---- input parameters
extern int BWIPeriod=14;
//---- buffers
double BWIBuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
   string short_name;
//---- indicator line
   SetIndexStyle(0,DRAW_LINE);
   SetIndexBuffer(0,BWIBuffer);
//---- name for DataWindow and indicator subwindow label
   short_name="BWI("+BWIPeriod+")";
   IndicatorShortName(short_name);
   SetIndexLabel(0,short_name);
//----
   SetIndexDrawBegin(0,BWIPeriod);
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Momentum                                                         |
//+------------------------------------------------------------------+
int start()
  {
   int i,counted_bars=IndicatorCounted();
//----
   if(Bars<=BWIPeriod) return(0);
//---- initial zero
   if(counted_bars<1)
      for(i=1;i<=BWIPeriod;i++) BWIBuffer[Bars-i]=0.0;
//----
   i=Bars-BWIPeriod-1;
   if(counted_bars>=BWIPeriod) i=Bars-counted_bars-1;
   while(i>=0)
     {
      BWIBuffer[i]=iBands(NULL,0,BWIPeriod,2,0,PRICE_CLOSE,MODE_UPPER,i)-iBands(NULL,0,BWIPeriod,2,0,PRICE_CLOSE,MODE_LOWER,i);
      i--;
     }
   return(0);
  }
//+------------------------------------------------------------------+